PRIMARY_DB_UNIQUE_NAME VARCHAR2(30): For any Standby database (Physical, Logical, or Reporting), this column will contain the DB_UNIQUE_NAME of the Primary database that this Standby last received current redo from.

If this standby has not received any current redo since last being started, then this column will be null.

For a Primary database that had previously been a Standby, this column will contain the DB_UNIQUE_NAME of the last Primary that this database received current redo from while acting as a Standby.

For a Primary database that has never been a Standby, this column will be null.

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About Me

The views expressed on this blog are my own and do not necessarily reflect the views of ORACLE. Also the views and opinions expressed by visitors to this blog are theirs and do not necessarily reflect mine. I’ve been using Oracle since 2002.
My specialization:
Extensive experience with designing and implementing Oracle databases, including systems architect.
Extensive experience in Database Administration.
Expert in Oracle Real Application Clusters (RAC), Data Guard.
Expert in Oracle Database Security and Backup/Recovery solutions.
Extensive experience in migration projects.
Extensive performance tuning experience, specializing in instance tuning and SQL optimization.
Experienced in Consulting, classroom trainer in Oracle Database technology.
Implement, upgrade and tuning other Oracle products such as Exadata, GRID Control.
Extensive experience with Oracle Maximum Availability Architecture(MAA).
Attended many Exadata POC(Proof of Concept) in different countries.
Currently I am working at ORACLE's Azerbaijan office as Principal Technology Consultant.